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@boomiemct avatar
UTC

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2006 Vespa LX150
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@boomiemct avatar
2006 Vespa LX150
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Location: Fairfax, Va
UTC quote
My LX150 is dying (slowly) at idle but riding great otherwise. The air filter looks clean, I have oil and this still happens if I unplug the secondary air system. Other then checking the idle (I don't have a tach) is there anything else I should be looking for?

It may or may not be relevant but it just got cold here. I rode yesterday (when it was colder) without problems though.
@michael_h avatar
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2006 LX150 "Amadora"
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@michael_h avatar
2006 LX150 "Amadora"
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UTC quote
Do you mean that unless you are giving the scooter some gas, it just dies, or that the scooter idles and then slowly sputters and stops?
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2006 Vespa LX150
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2006 Vespa LX150
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Basically this morning I started it up and went inside to let the engine warm up. I then put on my gear and hopped on it and rode away. The engine was running just fine. When I went the six blocks to the first stop light and came to a stop the engine idled for a minute, sputtered and died. From that point on if I let it idle it would sputter and die. I made it home and put the scoot away.

Now after work I came home and checked the SAS and air filter (both okay as far as I can tell) and tried to start it up again. Same thing, starts up and idles fine while warming up, then dies at idle. If I hold the throttle open just a tiny crack it will be fine.
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2006 LX150 "Amadora"
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@michael_h avatar
2006 LX150 "Amadora"
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UTC quote
I can't help you with that one, I'm afraid. I had the problem with the scooter dying immediately unless you keep giving it a little gas while idling. Doesn't seem to be the same situation that you have. Sorry.
@rudegirl957 avatar
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2007 Sky Blue LX150, 1994 Hyosung Rally
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Location: Gongju, Chungcheongnamdo, South Korea
 
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@rudegirl957 avatar
2007 Sky Blue LX150, 1994 Hyosung Rally
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Location: Gongju, Chungcheongnamdo, South Korea
UTC quote
When that happened to me, I just bumped up the idle a bit and it stopped happening.
@genie avatar
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Gobshite Shiva
Kymco Downtown 300i the 'Dolphin Noise'
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Gobshite Shiva
@genie avatar
Kymco Downtown 300i the 'Dolphin Noise'
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Location: London UK
UTC quote
it's not uncommon to have to adjust the idle speed a few times a year, as the air temperature changes.
@papa_smurf avatar
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Molto Verboso
GTS250ie, ET4
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Location: cincinnati, ohio, usa
 
Molto Verboso
@papa_smurf avatar
GTS250ie, ET4
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Location: cincinnati, ohio, usa
UTC quote
sounds like a clogged idle jet. thats what happened to both my wife and I one time.
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2006 Vespa LX150
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2006 Vespa LX150
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UTC quote
Papa Smurf wrote:
sounds like a clogged idle jet. thats what happened to both my wife and I one time.
Do you just run cleaner through the engine or what?

My first thought was just to increase the idle but I didn't want to be covering up another potential problem.
@papa_smurf avatar
UTC

Molto Verboso
GTS250ie, ET4
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Location: cincinnati, ohio, usa
 
Molto Verboso
@papa_smurf avatar
GTS250ie, ET4
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Posts: 1244
Location: cincinnati, ohio, usa
UTC quote
Actually the vespa dealer took the carb loose and rotated it ( still on the manifold) until the bowl was pointing up. He took the bowl and float off and pushed a tiny steel wire thru the jet. He used a steel wire off a small wire brush and its diameter was really tiny.
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@boomiemct avatar
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2006 Vespa LX150
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2006 Vespa LX150
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Location: Fairfax, Va
UTC quote
Well I don't know if it is because the weather warmed up or because I turned the idle screw 1/8 clockwise but it runs great now. I'll probably run it tomorrow morning when it's cold to make sure.
@beergeek avatar
UTC

Hooked
Black '07 LX 150
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Location: Seattle
 
Hooked
@beergeek avatar
Black '07 LX 150
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Location: Seattle
UTC quote
Might be a dirty jet, but more likely bumping up your revs will be the fix (at least it was for me when I had the same happen). Also, be sure you are warming up your bike longer than usual now that its cold out.
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